TY - JOUR
T1 - Model, software, and database for computation of line-mixing effects in infrared Q branches of atmospheric CO2 - I. Symmetric isotopomers
AU - Rodrigues, R.
AU - Jucks, K.W.
AU - Lacome, N.
AU - Blanquet, Ghislain
AU - Walrand, Jacques
AU - Traub, W.A.
AU - Khalil, B.
AU - Le Doucen, R.
AU - Valentin, A.
AU - Camy-Peyret, C.
AU - Bonamy, L.
AU - Hartmann, J.-M.
N1 - Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.
PY - 1999/2/1
Y1 - 1999/2/1
N2 - A theoretical model based on the energy-corrected sudden approximation is used in order to account for line-mixing effects in infrared Q branches of symmetric isotopomers of CO. Its performance is demonstrated by comparisons with a large number (about 130) of CO-N and CO-O laboratory spectra recorded by several instrument setup: nine Q branches of different vibrational symmetries lying between 4 and 17 μm are investigated in wide ranges of pressure (0.05-10 atm) and temperature (200-300 K). The model is used to generate a set of suitable parameters and FORTRAN software (available by ftp) for the calculation of the absorption within CO. CO, and CO infrared Q branches under atmospheric conditions, which can be easily included in existing radiance/transmission computer codes. Comparisons are made between many (about 280) computed atmospheric spectra and values measured using two different balloon-borne high-resolution Fourier transform instruments: transmission (solar occultation) as well as radiance (limb emission) measurements of seven Q branches between 12 and 17 μm for a large range of atmospheric air masses and pressure/temperature conditions have been used, including the v band of both CO and CO. The results confirm the need to account for the effects of line-mixing and demonstrate the capability of the model to represent accurately the absorption in regions which are often used for temperature/pressure sounding of the atmosphere by space instruments. Finally, quantitative criteria assessing the validity of the widely used Rosenkranz first-order approximation are given.
AB - A theoretical model based on the energy-corrected sudden approximation is used in order to account for line-mixing effects in infrared Q branches of symmetric isotopomers of CO. Its performance is demonstrated by comparisons with a large number (about 130) of CO-N and CO-O laboratory spectra recorded by several instrument setup: nine Q branches of different vibrational symmetries lying between 4 and 17 μm are investigated in wide ranges of pressure (0.05-10 atm) and temperature (200-300 K). The model is used to generate a set of suitable parameters and FORTRAN software (available by ftp) for the calculation of the absorption within CO. CO, and CO infrared Q branches under atmospheric conditions, which can be easily included in existing radiance/transmission computer codes. Comparisons are made between many (about 280) computed atmospheric spectra and values measured using two different balloon-borne high-resolution Fourier transform instruments: transmission (solar occultation) as well as radiance (limb emission) measurements of seven Q branches between 12 and 17 μm for a large range of atmospheric air masses and pressure/temperature conditions have been used, including the v band of both CO and CO. The results confirm the need to account for the effects of line-mixing and demonstrate the capability of the model to represent accurately the absorption in regions which are often used for temperature/pressure sounding of the atmosphere by space instruments. Finally, quantitative criteria assessing the validity of the widely used Rosenkranz first-order approximation are given.
UR - http://www.scopus.com/inward/record.url?scp=0033059339&partnerID=8YFLogxK
U2 - 10.1016/S0022-4073(97)00208-2
DO - 10.1016/S0022-4073(97)00208-2
M3 - Article
AN - SCOPUS:0033059339
SN - 0022-4073
VL - 61
SP - 153
EP - 184
JO - Journal of Quantitative Spectroscopy and Radiative Transfer
JF - Journal of Quantitative Spectroscopy and Radiative Transfer
IS - 2
ER -